The LaserMax Uni-Max ES is a constant beam red laser with an additional rail built in making it ideal for mounting tactical lights or extra accessories. Weighing in at less than an ounce, the matchbox size Uni-Max ES requires 1.75" of space and can be mounted on virtually anything with a rail. The Uni-Max ES is perfect for use on medium and full-size pistols, carbines, rifles, shotguns and more. It is the next generation of the original Uni-Max with some slight modifications. This new Essential Series Uni-Max only features a constant beam for quick acquisition with same durability of the original Uni-Max.